Hey Vaughn,
i have a Genz Benz El Diablo 100/50 head with a 2x12 G-Flex cab. The cab is ported. It sounds pretty good, but you really have to crank it to get it to its sweet spot. I usually run it at 50 Watts, and if I get into a situation where I need more volume I'll probably add another 2x12 to the mix. The head is based on a Marshall with an active three band EQ section and about every upgrade ever thought of. What speaker or mix of speakers would you recommend for a classic rock tone in this setup?